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I just bought a 99 528i and it had an after market deck in it that didn't work so I bought a new one and wired it in and I have power to my deck but no sound from my speakers can any one help me with this problem?

My father's E39 had the same problem, it turns out the Harness Adapter was missing a piece, check to see that your Harness Adapter is correct for your car, and if you think it is try wiring your OEM deck back in to see if it works.